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Renesas ISL85418DEMO1Z
- Part No.:
- ISL85418DEMO1Z
- Manufacturer:
- Renesas
- Package:
- Datasheet:
-
ISL85418DEMO1Z.pdf
- Description:
- EVAL BOARD FOR ISL85418
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Product details
Overview
ISL85418DEMO1Z from Renesas Electronics is a demonstration board designed to evaluate the ISL85418 synchronous buck regulator-a 3V–40V input, 3.3V/800mA output DC-DC converter in a 4mm×3mm 12-lead DFN package. It operates at 500kHz fixed switching frequency, delivers >84% peak efficiency at 50% load, and supports PFM/PWM mode selection for light-load optimization. The board is configured for point-of-load power delivery in industrial and embedded systems.
For engineers reviewing the ISL85418DEMO1Z datasheet, ISL85418DEMO1Z pinout, ISL85418DEMO1Z application, or ISL85418DEMO1Z equivalent, this board enables rapid validation of wide-VIN buck performance-including dynamic load response (4.5% deviation), <10mV output ripple at 800mA, soft-start control, power-good signaling, and external frequency synchronization-under real-world thermal and layout conditions.
Technical Context
The ISL85418DEMO1Z implements the ISL85418 IC in a fully assembled, tested reference design with optimized component selection: 22µH power inductor (Wurth 74404054220), 69µF total output capacitance (47µF + 22µF X5R), and precision feedback network (R1 = 90.9kΩ, R2 = 20kΩ) for 3.3V regulation. All critical compensation components-including CSS (33nF), C7 (470pF), and R3 (150kΩ)-are populated per the ISL85418 datasheet recommendations.
Board-level features include jumper-selectable SYNC mode (PWM default via 200kΩ pull-up; PFM when grounded), FS pin configuration for frequency adjustment (300kHz–2MHz), and dual-mode soft-start (internal via R15 = 0Ω or external). Test points (P1–P9) provide direct access to VIN, VOUT, EN, PG, SS, and SYNC signals for oscilloscope and load-step characterization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 3V to 40V - Supports unregulated industrial rails, automotive battery transients, and wide-input adapter outputs. |
| VOUT Configuration | 3.3V preset (0.6V–15V adjustable) - Set by R1/R2 feedback divider; enables quick reconfiguration for diverse system voltage domains. |
| Max Output Current | 800mA continuous - Validated with 22µH inductor and thermal management for sustained operation at +25°C ambient. |
| Switching Frequency | 500kHz fixed (300kHz–2MHz adjustable via FS pin) - Balances efficiency, EMI, and external component size; default ties FS to VCC. |
| Peak Efficiency | >84% at 50% load (VIN=24V, VOUT=3.3V) - Achieved using integrated high-side/low-side NMOS FETs and synchronous rectification. |
| Output Ripple | <10mV p-p at 800mA - Measured with AC-coupled scope; enabled by low-ESR ceramic output capacitors and optimized layout. |
| Load Transient Response | 4.5% deviation (0A→800mA→0A, di/dt = 2A/µs) - Demonstrates fast loop stability without external compensation. |
Availability
ISL85418DEMO1Z is available at Aetrix Electronics and suitable for industrial automation, embedded computing, and test equipment applications requiring stable component supply, rapid prototyping capability, and validated power-conversion reference designs.
Supply support for ISL85418DEMO1Z includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Renesas Electronics Corporation is a global semiconductor leader delivering microcontrollers, analog, power, and SoC solutions for automotive, industrial, infrastructure, and IoT applications.
The ISL85418DEMO1Z belongs to Renesas' ISL854xx family of wide-VIN synchronous buck regulators, engineered specifically for robust, low-quiescent-current point-of-load conversion in space-constrained, thermally demanding environments.
FAQ
What is the primary function of the ISL85418DEMO1Z?
The ISL85418DEMO1Z is a fully assembled demonstration board that showcases the ISL85418 synchronous buck regulator IC. It provides a ready-to-test platform for evaluating 3V–40V input to 3.3V/800mA output conversion, including dynamic response, efficiency, thermal behavior, and mode-switching (PFM/PWM) under real operating conditions. The ISL85418DEMO1Z requires no additional components to operate.
Can the output voltage of the ISL85418DEMO1Z be adjusted, and how?
Yes, the ISL85418DEMO1Z output voltage is adjustable from 0.6V to 15V by modifying the feedback resistor divider (R1 and R2). The board ships preset to 3.3V using R1 = 90.9kΩ and R2 = 20kΩ. Equation 1 in the AN1908 User's Manual defines the relationship: VOUT = 0.6 × (1 + R2/R1). For VOUT < 1.8V, frequency and compensation must be adjusted per the ISL85418 datasheet due to minimum on-time constraints.
How is switching frequency controlled on the ISL85418DEMO1Z?
Switching frequency on the ISL85418DEMO1Z is controlled via the FS pin. By default (R10 = 0Ω), FS is tied to VCC, setting fSW = 500kHz. To adjust frequency between 300kHz and 2MHz, remove R10 and install a resistor (R12) between FS and GND: 340kΩ yields 300kHz, 32.4kΩ yields 2MHz. The board includes footprint and documentation (AN1908 Section "Frequency Control") to support this modification. Leaving FS floating is prohibited.
What are the key test points and their functions on the ISL85418DEMO1Z?
The ISL85418DEMO1Z provides nine labeled test points: P1/P2 (SYNC), P4 (VIN), P5 (GND), P7 (VOUT), P9 (GND), and unpopulated pads for EN, PG, SS, and FB. These enable direct probing of critical signals during evaluation-e.g., measuring load-step response on VOUT (P7), verifying power-good assertion on PG, validating enable sequencing on EN, and monitoring synchronization timing on SYNC-without soldering or signal injection.
Does the ISL85418DEMO1Z support external synchronization, and how is it configured?
Yes, the ISL85418DEMO1Z supports external clock synchronization via the SYNC pin (P1/P2). By default, R6 (200kΩ) pulls SYNC to VCC, enabling internal PWM operation at the selected switching frequency. To use an external clock, disconnect R6 and drive SYNC with a clean CMOS signal matching the target frequency. The board's schematic (Figure 10) and AN1908 Section "SYNC Control" confirm this configuration and specify maximum input voltage and slew-rate limits per the ISL85418 datasheet.
ISL85418DEMO1Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Main Purpose:
- DC/DC, Step Down
- Outputs and Type:
- 1 Non-Isolated Output
- Voltage - Output:
- -
- Current - Output:
- 3.3V
- Voltage - Input:
- 800mA
- Regulator Topology:
- 3V ~ 36V
- Frequency - Switching:
- Buck
- Contents:
- 500kHz
- Utilized IC / Part:
- Board(s)
- Power - Output:
- ISL85418
ISL85418DEMO1Z FAQ
1.How can I place an order for ISL85418DEMO1Z through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL85418DEMO1Z on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for ISL85418DEMO1Z reliable?
The price and inventory of ISL85418DEMO1Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL85418DEMO1Z is usually 5 days.
3.What payment methods are accepted for ISL85418DEMO1Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL85418DEMO1Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL85418DEMO1Z?
ISL85418DEMO1Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL85418DEMO1Z order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for ISL85418DEMO1Z?
For technical support, including ISL85418DEMO1Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL85418DEMO1Z requirements.
6.How does Aetrix verify that ISL85418DEMO1Z is sourced from the original manufacturer or authorized distributors?
All ISL85418DEMO1Z products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ISL85418DEMO1Z meets industry standards.
7.What is the process for return or replacement of ISL85418DEMO1Z?
All ISL85418DEMO1Z units undergo pre-shipment inspection (PSI). If there is an issue with ISL85418DEMO1Z, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The ISL85418DEMO1Z part is unused and in its original packaging.
Return procedure for ISL85418DEMO1Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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